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MDEV-6838: Using too big key for internal temp tables

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This bug manifests due to wrong computation and evaluation of
keyinfo->key_length. The issues were:
* Using table->file->max_key_length() as an absolute value that must not be
  reached for a key, while it represents the maximum number of bytes
  possible for a table key.
* Incorrectly computing the keyinfo->key_length size during
  KEY_PART_INFO creation. The metadata information regarding the key
  such the field length (for strings) was added twice.
This commit is contained in:
Vicențiu Ciorbaru
2015-02-28 23:44:55 +02:00
parent fa87fc733d
commit 45b6edb158
6 changed files with 62 additions and 12 deletions
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2
sql/table.h
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@@ -1269,7 +1269,7 @@ public:
bool add_tmp_key(uint key, uint key_parts,
uint (*next_field_no) (uchar *), uchar *arg,
bool unique);
void create_key_part_by_field(KEY *keyinfo, KEY_PART_INFO *key_part_info,
void create_key_part_by_field(KEY_PART_INFO *key_part_info,
Field *field, uint fieldnr);
void use_index(int key_to_save);
void set_table_map(table_map map_arg, uint tablenr_arg)